Fix some memory leaks (#3779)

include/PluginFactory.h

@@ -25,6 +25,8 @@
 #ifndef PLUGINFACTORY_H
 #define PLUGINFACTORY_H
 
+#include <memory>
+
 #include <QtCore/QFileInfo>
 #include <QtCore/QList>
 
@@ -39,14 +41,15 @@ public:
 	struct PluginInfo
 	{
 		PluginInfo() : library(nullptr), descriptor(nullptr) {}
+
 		const QString name() const;
 		QFileInfo file;
-		QLibrary* library;
+		std::shared_ptr<QLibrary> library;
 		Plugin::Descriptor* descriptor;
 
-		bool isNull() const {return library == 0;}
+		bool isNull() const {return ! library;}
 	};
-	typedef QList<PluginInfo*> PluginInfoList;
+	typedef QList<PluginInfo> PluginInfoList;
 	typedef QMultiMap<Plugin::PluginTypes, Plugin::Descriptor*> DescriptorMap;
 
 	PluginFactory();
@@ -80,11 +83,11 @@ public slots:
 private:
 	DescriptorMap m_descriptors;
 	PluginInfoList m_pluginInfos;
-	QMap<QString, PluginInfo*> m_pluginByExt;
+	QMap<QString, PluginInfo> m_pluginByExt;
 
 	QHash<QString, QString> m_errors;
 
-	static PluginFactory* s_instance;
+	static std::unique_ptr<PluginFactory> s_instance;
 };
 
 #define pluginFactory PluginFactory::instance()

include/Song.h

@@ -67,7 +67,7 @@ public:
 	void clearErrors();
 	void collectError( const QString error );
 	bool hasErrors();
-	QString* errorSummary();
+	QString errorSummary();
 
 	class PlayPos : public MidiTime
 	{
@@ -359,7 +359,7 @@ private:
 
 	bool m_loadingProject;
 
-	QList<QString> * m_errors;
+	QStringList m_errors;
 
 	PlayModes m_playMode;
 	PlayPos m_playPos[Mode_Count];

src/core/PluginFactory.cpp

@@ -42,7 +42,7 @@ qint64 qHash(const QFileInfo& fi)
 	return qHash(fi.absoluteFilePath());
 }
 
-PluginFactory* PluginFactory::s_instance = nullptr;
+std::unique_ptr<PluginFactory> PluginFactory::s_instance;
 
 PluginFactory::PluginFactory()
 {
@@ -87,9 +87,9 @@ PluginFactory::~PluginFactory()
 PluginFactory* PluginFactory::instance()
 {
 	if (s_instance == nullptr)
-		s_instance = new PluginFactory();
+		s_instance.reset(new PluginFactory());
 
-	return s_instance;
+	return s_instance.get();
 }
 
 const Plugin::DescriptorList PluginFactory::descriptors() const
@@ -109,16 +109,15 @@ const PluginFactory::PluginInfoList& PluginFactory::pluginInfos() const
 
 const PluginFactory::PluginInfo PluginFactory::pluginSupportingExtension(const QString& ext)
 {
-	PluginInfo* info = m_pluginByExt.value(ext, nullptr);
-	return info == nullptr ? PluginInfo() : *info;
+	return m_pluginByExt.value(ext, PluginInfo());
 }
 
 const PluginFactory::PluginInfo PluginFactory::pluginInfo(const char* name) const
 {
-	for (const PluginInfo* info : m_pluginInfos)
+	for (const PluginInfo& info : m_pluginInfos)
 	{
-		if (qstrcmp(info->descriptor->name, name) == 0)
-			return *info;
+		if (qstrcmp(info.descriptor->name, name) == 0)
+			return info;
 	}
 	return PluginInfo();
 }
@@ -150,7 +149,7 @@ void PluginFactory::discoverPlugins()
 
 	for (const QFileInfo& file : files)
 	{
-		QLibrary* library = new QLibrary(file.absoluteFilePath());
+		auto library = std::make_shared<QLibrary>(file.absoluteFilePath());
 
 		if (! library->load()) {
 			m_errors[file.baseName()] = library->errorString();
@@ -167,7 +166,7 @@ void PluginFactory::discoverPlugins()
 			descriptorName = descriptorName.mid(3);
 		}
 
-		Plugin::Descriptor* pluginDescriptor = (Plugin::Descriptor*) library->resolve(descriptorName.toUtf8().constData());
+		Plugin::Descriptor* pluginDescriptor = reinterpret_cast<Plugin::Descriptor*>(library->resolve(descriptorName.toUtf8().constData()));
 		if(pluginDescriptor == nullptr)
 		{
 			qWarning() << qApp->translate("PluginFactory", "LMMS plugin %1 does not have a plugin descriptor named %2!").
@@ -175,26 +174,20 @@ void PluginFactory::discoverPlugins()
 			continue;
 		}
 
-		PluginInfo* info = new PluginInfo;
-		info->file = file;
-		info->library = library;
-		info->descriptor = pluginDescriptor;
+		PluginInfo info;
+		info.file = file;
+		info.library = library;
+		info.descriptor = pluginDescriptor;
 		pluginInfos << info;
 
-		for (const QString& ext : QString(info->descriptor->supportedFileTypes).split(','))
+		for (const QString& ext : QString(info.descriptor->supportedFileTypes).split(','))
 		{
 			m_pluginByExt.insert(ext, info);
 		}
 
-		descriptors.insert(info->descriptor->type, info->descriptor);
+		descriptors.insert(info.descriptor->type, info.descriptor);
 	}
 
-
-	for (PluginInfo* info : m_pluginInfos)
-	{
-		delete info->library;
-		delete info;
-	}
 	m_pluginInfos = pluginInfos;
 	m_descriptors = descriptors;
 }

src/core/Song.cpp

@@ -86,7 +86,6 @@ Song::Song() :
 	m_playing( false ),
 	m_paused( false ),
 	m_loadingProject( false ),
-	m_errors( new QList<QString>() ),
 	m_playMode( Mode_None ),
 	m_length( 0 ),
 	m_patternToPlay( NULL ),
@@ -1138,12 +1137,12 @@ void Song::loadProject( const QString & fileName )
 	{
 		if ( gui )
 		{
-			QMessageBox::warning( NULL, tr("LMMS Error report"), *errorSummary(),
+			QMessageBox::warning( NULL, tr("LMMS Error report"), errorSummary(),
 							QMessageBox::Ok );
 		}
 		else
 		{
-			QTextStream(stderr) << *Engine::getSong()->errorSummary() << endl;
+			QTextStream(stderr) << Engine::getSong()->errorSummary() << endl;
 		}
 	}
 
@@ -1515,36 +1514,31 @@ void Song::removeController( Controller * controller )
 
 void Song::clearErrors()
 {
-	m_errors->clear();
+	m_errors.clear();
 }
 
 
 
 void Song::collectError( const QString error )
 {
-	m_errors->append( error );
+	m_errors.append( error );
 }
 
 
 
 bool Song::hasErrors()
 {
-	return ( m_errors->length() > 0 );
+	return ( m_errors.length() > 0 );
 }
 
 
 
-QString* Song::errorSummary()
+QString Song::errorSummary()
 {
-	QString* errors = new QString();
+	QString errors = m_errors.join("\n") + '\n';
 
-	for ( int i = 0 ; i < m_errors->length() ; i++ )
-	{
-		errors->append( m_errors->value( i ) + "\n" );
-	}
-
-	errors->prepend( "\n\n" );
-	errors->prepend( tr( "The following errors occured while loading: " ) );
+	errors.prepend( "\n\n" );
+	errors.prepend( tr( "The following errors occured while loading: " ) );
 
 	return errors;
 }

src/gui/editors/SongEditor.cpp

@@ -82,6 +82,7 @@ SongEditor::SongEditor( Song * song ) :
 	m_smoothScroll( ConfigManager::inst()->value( "ui", "smoothscroll" ).toInt() ),
 	m_mode(DrawMode)
 {
+	m_zoomingModel->setParent(this);
 	// create time-line
 	int widgetTotal = ConfigManager::inst()->value( "ui",
 							"compacttrackbuttons" ).toInt()==1 ?